US 12,435,756 B2
Dustproof seal structure
Hisayoshi Sakai, Kanagawa (JP); and Tsutomu Ugajin, Tochigi (JP)
Assigned to MITUTOYO CORPORATION, Kawasaki (JP)
Filed by Mitutoyo Corporation, Kanagawa (JP)
Filed on Aug. 4, 2023, as Appl. No. 18/365,320.
Claims priority of application No. 2022-130326 (JP), filed on Aug. 18, 2022.
Prior Publication US 2024/0063680 A1, Feb. 22, 2024
Int. Cl. F16C 33/74 (2006.01); F16C 17/04 (2006.01)
CPC F16C 17/045 (2013.01) [F16C 33/748 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A dustproof seal structure comprising:
a rotor assembly having a disc-shaped thrust plate and a columnar rotor provided on a lower surface of the thrust plate;
a stator assembly rotatably supporting the rotor assembly, wherein the stator assembly forms a horizontal thrust aerostatic bearing between the lower surface of the thrust plate and an upper surface of the stator assembly when compressed air is supplied between the lower surface of the thrust plate and the upper surface of the stator assembly, wherein
the thrust plate and the stator assembly form a sealing portion through which compressed air flows, at a position radially outward from the thrust aerostatic bearing, and
the sealing portion includes an inclined flow path that extends upwardly from an outer peripheral surface of the thrust plate toward an inside in a radial direction.